Implement health bar system: add HealthBar class for managing health, integrate health updates in HUDLayer, and modify enemy attack handling to reflect damage taken.

game/character.rb

@@ -35,7 +35,7 @@ class Character
     end
 
     @current_animation = :idle_front
-    @facing = :front
+    @facing = 0.0
 
     $bus.on(:player_position) do
       next [@world_x, @world_y]
@@ -44,6 +44,10 @@ class Character
     $bus.on(:collides?) do |rect|
       next collides?(rect) ? :character : nil
     end
+
+    $bus.on(:player_direction) do
+      @facing
+    end
   end
 
   def rect
@@ -56,6 +60,18 @@ class Character
     false
   end
 
+  def angle_to_direction(angle)
+    if angle >= -Math::PI / 4 && angle < Math::PI / 4
+      :right
+    elsif angle >= Math::PI / 4 && angle < 3 * Math::PI / 4
+      :front   # down
+    elsif angle >= -3 * Math::PI / 4 && angle < -Math::PI / 4
+      :back    # up
+    else
+      :left
+    end
+  end
+
   def update(dt)
     dx = 0.0
     dy = 0.0
@@ -68,18 +84,11 @@ class Character
     moving = dx != 0 || dy != 0
 
     if moving
-      if dy < 0
+      @facing = Math.atan2(dy, dx)
-        @facing = :back
-      elsif dy > 0
-        @facing = :front
-      elsif dx < 0
-        @facing = :left
-      elsif dx > 0
-        @facing = :right
-      end
     end
 
-    @current_animation = moving ? :"walk_#{@facing}" : :"idle_#{@facing}"
+    direction = angle_to_direction(@facing)
+    @current_animation = moving ? :"walk_#{direction}" : :"idle_#{direction}"
 
     # Normalize vector if moving diagonally
     if dx != 0 && dy != 0

game/enemy/base.rb

@@ -26,9 +26,9 @@ class Enemy
     @w = 25
     @h = 30
     @health = health
-    @lorentz = false
+    @lorentz = $bus.get(:lorentz_field?) || false
 
-    $bus.on(:lorentz_field?) do |lorentz|
+    $bus.on(:lorentz_field!) do |lorentz|
       @lorentz = lorentz
     end
 
@@ -41,9 +41,7 @@ class Enemy
 
   def take_damage(amount)
     @health -= amount
-    pp "Enemy takes #{amount} damage, health now #{@health}"
     if @health <= 0
-      pp "Enemy dies"
       $bus.emit(:enemy_died, self)
     end
   end
@@ -76,6 +74,11 @@ class Enemy
       self.class.frame_size[2]
     )
 
+    # Health bar
+
+    health_width = (@w * @health / 100.0)
+    Gosu.draw_rect(screen_x - @w / 2, screen_y - @h / 2 - 10, health_width, 5, Gosu::Color.new(0xFF00FF00), Float::INFINITY)
+
     if $bus.get(:settings, :debug)
       Gosu.draw_rect(screen_x - @w / 2, screen_y - @h / 2, @w, @h, Gosu::Color.new(0x40FF0000), Float::INFINITY)
     end

game/enemy/force.rb

@@ -6,11 +6,13 @@ class Force < Enemy
   def initialize(x, y)
     super(x, y, 100)
 
-    $bus.on(:occams_razor_attack) do |attack_x, attack_y, range, damage|
+    $bus.on(:attack) do |attack_x, attack_y, range, damage|
       # Whoa, did'nt know ruby had hypot functions built in!
       if Math.hypot(@x - attack_x, @y - attack_y) <= range
         take_damage(damage)
+        next true
       end
+      false
     end
   end
 end

game/hud/health.rb

@@ -0,0 +1,27 @@
+class HealthBar
+  attr_reader :health, :max_health
+
+  def initialize(max_health)
+    @max_health = max_health
+    @health = max_health
+  end
+
+  def take_damage(amount)
+    @health -= amount
+    @health = 0 if @health < 0
+  end
+
+  def heal(amount)
+    @health += amount
+    @health = @max_health if @health > @max_health
+  end
+
+  def draw(x, y)
+    # Draw the background of the health bar (red)
+    Gosu.draw_rect(x, y, 100, 10, Gosu::Color::RED)
+
+    # Draw the foreground of the health bar (green) based on current health
+    health_width = (health.to_f / max_health) * 100
+    Gosu.draw_rect(x, y, health_width, 10, Gosu::Color::GREEN)
+  end
+end

game/hud/layer.rb

@@ -1,13 +1,15 @@
 require_relative "inventory"
+require_relative "health"
 
 class HUDLayer
   def initialize
     @hud_bg = Gosu::Image.new("assets/images/hud.png", retro: true)
     @hud_fg = Gosu::Image.new("assets/images/hud_fg.png", retro: true)
     @inventory = Inventory.new
+    @health = HealthBar.new(100)
 
     $bus.on(:enemy_attack) do |damage|
-      pp "Player takes #{damage} damage!"
+      @health.take_damage(damage)
     end
   end
 
@@ -15,6 +17,7 @@ class HUDLayer
     @hud_bg.draw(0, 0, Float::INFINITY)
 
     @inventory.draw
+    @health.draw(10, 10)
 
     @hud_fg.draw(0, 0, Float::INFINITY)
   end

game/weapons/blade_of_recursion.rb

@@ -0,0 +1,30 @@
+class BladeOfRecursion
+  def initialize
+    @damage = 1
+    @range = 200
+    @speed = 500
+    @x = 0
+    @y = 0
+    @direction = nil
+  end
+
+  def attack(direction)
+    @direction = direction
+    @x, @y = $bus.get(:player_position)
+  end
+
+  def update(dt)
+    return unless @direction
+
+    @x += Math.cos(@direction) * @speed * dt
+    @y += Math.sin(@direction) * @speed * dt
+
+    $bus.get(:attack, @x, @y, @range, @damage)
+
+    # If the blade has traveled its max range, reset it
+    player_x, player_y = $bus.get(:player_position)
+    if Math.hypot(@x - player_x, @y - player_y) > @range
+      @direction = nil
+    end
+  end
+end

game/weapons/handler.rb

@@ -20,8 +20,16 @@ class WeaponHandler
     return unless @weapons.key?(selected_item)
 
     weapon = @weapons[selected_item]
-    if $bus.get(:count, selected_item) > 0 && Gosu.button_down?(Gosu::KB_SPACE)
+    if $bus.get(:count, selected_item) > 0
-      weapon.attack
+      if Gosu.button_down?(Gosu::KB_SPACE)
+        direction = $bus.get(:player_direction)
+        weapon.attack(direction)
+      elsif Gosu.button_down?(Gosu::MS_LEFT)
+        player_x, player_y = $bus.get(:player_position)
+        mouse_x, mouse_y = $bus.get(:mouse_position)
+        direction = Math.atan2(mouse_y - player_y, mouse_x - player_x)
+        weapon.attack(direction)
+      end
     end
   end
 

game/weapons/lorentz_field.rb

@@ -6,6 +6,10 @@ class LorentzField
     @active = false
     @font = Gosu::Font.new(24, name: "assets/fonts/tn.ttf")
 
+    $bus.on(:lorentz_field?) do
+      next @active
+    end
+
     $bus.on(:lorentz_field) do
       if @active
         t = @time
@@ -27,12 +31,12 @@ class LorentzField
     end
   end
 
-  def attack
+  def attack(_direction)
     return if @active
     $bus.emit(:consume, :lorentz_field, 1)
     @active = true
     @time = 0
-    $bus.emit(:lorentz_field?, true)
+    $bus.emit(:lorentz_field!, true)
   end
 
   def update(dt)
@@ -42,7 +46,7 @@ class LorentzField
     if @time >= BASE_TIME
       @time = 0
       @active = false
-      $bus.emit(:lorentz_field?, false)
+      $bus.emit(:lorentz_field!, false)
     end
   end
 

game/weapons/occams_razor.rb

@@ -8,7 +8,7 @@ class OccamsRazor
     @range = 45 # how many pixels from player center to enemy center the attack hits, this is a melee weapon so it should be small
   end
 
-  def attack
+  def attack(_direction)
     return if @active
 
     @active = true
@@ -16,7 +16,7 @@ class OccamsRazor
 
     # Check for enemies in range and deal damage
     player_x, player_y = $bus.get(:player_position)
-    $bus.emit(:occams_razor_attack, player_x, player_y, @range, @damage)
+    $bus.emit(:attack, player_x, player_y, @range, @damage)
   end
 
   def update(dt)